Rensselaer Researchers Make Virus-Fighting Face Masks

Rensselaer Polytechnic Institute researchers have developed an accessible way to make N95 face masks not only effective barriers to germs, but on-contact germ killers. The antiviral, antibacterial masks can potentially be worn longer, causing less plastic waste as the masks do not need to be replaced as frequently.

Helen Zha, assistant professor of chemical and biological engineering and a member of the Center for Biotechnology and Interdisciplinary Studies at Rensselaer (CBIS), collaborated with Edmund Palermo, associate professor of materials science and engineering and a member of the Center for Materials, Devices, and Integrated systems (cMDIS) at Rensselaer, to fight infectious respiratory disease and environmental pollution with the perfect recipe to improve face masks.

“This was a multifaceted materials engineering challenge with a great, diverse team of collaborators,” Palermo said. “We think the work is a first step toward longer-lasting, self-sterilizing personal protective equipment, such as the N95 respirator. It may help reduce transmission of airborne pathogens in general.”

In research recently published in Applied ACS Materials and Interfaces, the team successfully grafted broad-spectrum antimicrobial polymers onto the polypropylene filters used in N95 face masks.

“The active filtration layers in N95 masks are very sensitive to chemical modification,” said Zha. “It can make them perform worse in terms of filtration, so they essentially no longer perform like N95s. They’re made out of polypropylene, which is difficult to chemically modify. Another challenge is that you don't want to disrupt the very fine network of fibers in these masks, which might make them more difficult to breathe through.”

Future with geothermal energy

The GeoLaB makes geosciences tangible: the first underground laboratory is being built in the Black Forest / Odenwald, in which researchers can directly observe deep geothermal processes.
Credit: KIT

Local, emission-free and base load-bearing: geothermal energy is an essential component of the energy transition. With GeoLaB, a new and unique underground research infrastructure, the Karlsruhe Institute of Technology (KIT), the German Research Center for Geosciences GFZ and the Helmholtz Center for Environmental Research UFZ now want to accelerate research and prepare the technology for widespread use. The project is to be realized either in the Black Forest or Odenwald, the Helmholtz Association is funding with 35 million euros.

In order to achieve climate neutrality and at the same time become more independent of energy imports, the use of deep geothermal energy is suitable in most regions of Germany. Heat from the subsurface is available regardless of the time of the year and day, which makes geothermal energy suitable for base loads. It is also renewable because heat flows into the reservoir due to the temperature conditions and the transport processes.

“Geothermal energy has huge potential. In Germany alone, we could replace a third of the gas requirements for our heat - and given the climate catastrophe and the geopolitical world situation, we can no longer do without it,” says Professor Holger Hanselka, President of KIT and Vice President for the Energy Research Area of the Helmholtz Association. “So that we can use the necessary technologies safely and that the environmental impact remains minimal, we will now develop geothermal energy accordingly with the help of GeoLaB."

MIT engineers devise a recipe for improving any autonomous robotic system

Autonomous robots have come a long way since the fastidious Roomba. In recent years, artificially intelligent systems have been deployed in self-driving cars, last-mile food delivery, restaurant service, patient screening, hospital cleaning, meal prep, building security, and warehouse packing.

Each of these robotic systems is a product of an ad hoc design process specific to that particular system. In designing an autonomous robot, engineers must run countless trial-and-error simulations, often informed by intuition. These simulations are tailored to a particular robot’s components and tasks, in order to tune and optimize its performance. In some respects, designing an autonomous robot today is like baking a cake from scratch, with no recipe or prepared mix to ensure a successful outcome.

Now, MIT engineers have developed a general design tool for roboticists to use as a sort of automated recipe for success. The team has devised an optimization code that can be applied to simulations of virtually any autonomous robotic system and can be used to automatically identify how and where to tweak a system to improve a robot’s performance.

The team showed that the tool was able to quickly improve the performance of two very different autonomous systems: one in which a robot navigated a path between two obstacles, and another in which a pair of robots worked together to move a heavy box.

The researchers hope the new general-purpose optimizer can help to speed up the development of a wide range of autonomous systems, from walking robots and self-driving vehicles, to soft and dexterous robots, and teams of collaborative robots.

No ‘safest spot’ to minimize risk of COVID-19 transmission on trains

Credit: by Keira Burton

The researchers, from the University of Cambridge and Imperial College London, developed a mathematical model to help predict the risk of disease transmission in a train carriage, and found that in the absence of effective ventilation systems, the risk is the same along the entire length of the carriage.

The model, which was validated with a controlled experiment in a real train carriage, also shows that masks are more effective than social distancing at reducing transmission, especially in trains that are not ventilated with fresh air.

The results, reported in the journal Indoor Air, demonstrate how challenging it is for individuals to calculate absolute risk, and how important it is for train operators to improve their ventilation systems in order to help keep passengers safe.

Since COVID-19 is airborne, ventilation is vital in reducing transmission. And although COVID-19 restrictions have been lifted in the UK, the government continues to highlight the importance of good ventilation in reducing the risk of transmission of COVID-19, as well as other respiratory infections such as influenza.

“In order to improve ventilation systems, it’s important to understand how airborne diseases spread in certain scenarios, but most models are very basic and can’t make good predictions,” said first author Rick de Kreij, who completed the research while based at Cambridge’s Department of Applied Mathematics and Theoretical Physics. “Most simple models assume the air is fully mixed, but that’s not how it works in real life.

Britain's earliest humans

Artist reconstruction of Homo heidelbergensis making a flint hand axe  
Credit: Department of Archaeology, University of Cambridge / Illustration by Gabriel Ugueto

Homo heidelbergensis may have occupied southern Britain between 560,000 and 620,000 years ago

Archaeological discoveries made on the outskirts of Canterbury, Kent (England) confirm the presence of early humans in southern Britain between 560,000 and 620,000 years ago. The breakthrough, involving controlled excavations and radiometric dating, comes a century after stone tool artefacts were first uncovered at the site. The research, led by archaeologists at the University of Cambridge, confirms that Homo heidelbergensis, an ancestor of Neanderthals, occupied southern Britain in this period – when it was still attached to Europe – and gives tantalizing evidence hinting at some of the earliest animal hide processing in European prehistory.

Located in an ancient riverbed, the Canterbury site was originally discovered in the 1920s when local laborers unearthed artefacts known as hand axes, but by applying modern dating techniques to new excavations their age has finally been determined. Led by Cambridge’s Department of Archaeology, the recent excavations have not only dated the original site but also identified new flint artefacts, including the very first ‘scrapers’ to be discovered there. The researchers have dated these stone tool artefacts using infrared-radiofluorescence (IR-RF) dating, a technique which determines the point at which feldspar sand-grains were last exposed to sunlight, and thereby establishing when they were buried.

On the Road to Tiny Transistors, How Flat is Flat?

The general architecture of a traditional MOSFET vs. a 2D FET. A FET (field-effect transistor) is a device for regulating the flow of charge carriers (such as electrons) across a channel with three terminals: a source, a drain, and a gate. A MOSFET (metal oxide semiconductor field effect transistor) is by far the most widely used type of FET and is a building block of modern electronics, used in commercial electronic devices for more than 50 years. One main difference between the traditional 3D MOSFET and the “emerging technology” of the 2D FET is that the channel in a traditional MOSFET is in a 3D material, while a 2D FET’s channel is a 2D material.
Credit: Sean Kelley/NIST

Transistors are the building blocks of modern electronics, used in everything from televisions to laptops. As transistors have gotten smaller and more compact, so have electronics, which is why your cell phone is a super powerful computer that fits in the palm of your hand.

But there’s a scaling problem: Transistors are now so small that they are difficult to turn off. A key device element is the channel that charge carriers (such as electrons) travel across between electrodes. If that channel gets too short, quantum effects allow electrons to effectively jump from one side to another even when they shouldn’t.

One way to get past this sizing roadblock is to use layers of 2D materials – which are only a single atom thick – as the channel. Atomically thin channels can help enable even smaller transistors by making it harder for the electrons to jump between electrodes. One well-known example of a 2D material is graphene, whose discoverers won the Nobel Prize in Physics in 2010. But there are other 2D materials, and many believe they are the future of transistors, with the promise of scaling channel thickness down from its current 3D limit of a few nanometers (nm, billionths of a meter) to less than a single nanometer thickness.

Though research has exploded in this area, one issue has been persistently overlooked, according to a team of scientists from the National Institute of Standards and Technology (NIST), Purdue University, Duke University, and North Carolina State University. The 2D materials and their interfaces – which researchers intend to be flat when stacked on top of each other – may not, in fact, be flat. This non-flatness in turn can significantly affect device performance, sometimes in good ways and sometimes in bad.

Research Finds Repurposed Drug Inhibits Enzyme Related to COVID-19

With the end of the pandemic seemingly nowhere in sight, scientists are still very focused on finding new or alternative drugs to treat and stop the spread of COVID-19. In a first-of-its-kind study, researchers at the University of New Hampshire have found that using an already existing drug compound in a new way, known as drug repurposing, could be successful in blocking the activity of a key enzyme of the coronavirus, or SARS-CoV-2, which causes COVID-19.

“The goal was to slow or prevent the spread of the virus by using a strategic therapeutic that could possibly disrupt key steps in the viral life cycle at the molecular level, like the first contact with a healthy cell or the first step in replicating within an infected cell,” said Harish Vashisth, associate professor of chemical engineering.

In their study, recently published in the journal PROTEINS: Structure, Function, and Bioinformatics, researchers set out to target a key enzyme responsible for COVID-19, called the main protease enzyme Mpro, which has become a primary target of intense research and therapeutic development because it is essential for the virus to replicate. In this case, they explored the inhibiting properties of a derivative of the potent chemical compound known as Thiadiazolidinones, or TDZD, which are already being studied as a potential treatment for neurological disorders like Parkinson’s Disease. Researchers used a specific TDZD compound, known as CCG-50014, to target Mpro which acts like a molecular scissor by cutting up long chains of polypeptide proteins of the virus into smaller component proteins. These smaller segments can fold and mature to form new virus particles. Using molecular dynamics simulations combined with laboratory experiments, the researchers determined that TDZD compound was able to inhibit the Mpro enzyme.

Dopamine Regulates Insulin Secretion Through a Complex of Receptors

In a leap forward for diabetes research, Tokyo Tech researchers reveal that the feel-good hormone, dopamine, regulates insulin secretion through a heteromeric complex of receptors, thereby providing new targets for antidiabetic medication and therapy. The study is the first to elucidate the mechanism behind dopamine's down-regulation of insulin secretion.

Diabetes is a lifelong, chronic health condition caused by abnormalities in the body's production and use of the hormone insulin. Research has shown that the feel-good hormone, dopamine (DA), plays a key role in how the body regulates the production of insulin. Typically, insulin is secreted by cells in the pancreas called 'beta-cells,' in response to glucose—a process that is aptly called 'glucose-stimulated insulin secretion (GSIS). DA negatively regulates GSIS, leading to transient changes in the body's levels of insulins. But the mechanism behind this regulation was unknown, until now.

Recently, a team led by researchers from Tokyo Institute of Technology (Tokyo Tech) uncovered the precise mechanism through which DA regulates insulin secretions. Using a technique called "total internal reflection fluorescence microscopy," they were able to reveal that DA "receptors"—proteins on cells that DA can bind to—called D1 and D2, act in concert to achieve the transient regulation of insulin.

Plant stress transformed into rapid tests for dangerous chemicals

​ Representation of the plant hormone receptor system that the team engineered to recognize new chemicals. The central yellow molecule is the natural plant hormone ABA.
Credit: Sean Cutler/UCR

Scientists have modified proteins involved in plants’ natural response to stress, making them the basis of innovative tests for multiple chemicals, including banned pesticides and deadly, synthetic cannabinoids.

Diazinon is a banned insecticide that the research team is able to detect with their new plant-hormone-based sensor system.

During drought, plants produce ABA, a hormone that helps them hold on to water. Additional proteins, called receptors, help the plant recognize and respond to ABA. UC Riverside researchers helped demonstrate that these ABA receptors can be easily modified to quickly signal the presence of nearly 20 different chemicals.

The research team’s work in transforming these plant-based molecules is described in a new Nature Biotechnology journal article.

Researchers frequently need to detect all kinds of molecules, including those that harm people or the environment. Though methods to do that exist, they are often costly and require complicated equipment.

Exploring explosives for expanding geothermal energy

Eric Robey, left, a Sandia National Laboratories mechanical engineer, and Joseph Pope, a Sandia technologist, prepare a plexiglass cube for a small-scale explosion. The information from this study could be used to create new geothermal energy systems in locations where it is currently not feasible.
Left Click Image for screen size, Right Click Image and open in new tab for full size.
 Photo by Bret Latter

Why are scientists setting off small-scale explosions inside 1-foot cubes of plexiglass? They’re watching how fractures form and grow in a rock-like substance to see if explosives or propellants, similar to jet fuel, can connect geothermal wells in a predictable manner.

Geothermal energy has a lot of promise as a renewable energy source that is not dependent on the sun shining or the wind blowing, but it has some challenges to wide adoption. One challenge is that there are only a few places in the U.S. that naturally have the right combinations of hot rock close to the Earth’s surface with available underground water. Another challenge is the initial start-up cost of drilling and connecting geothermal wells. Eric Robey, a Sandia National Laboratories mechanical engineer, is leading a team to explore if explosives can reduce those two challenges.

“Our goal was to come up with a new way of creating a geothermal fracture network that you have a clear idea where it is going to go — it’s steerable and manageable — and you are utilizing fewer resources and being more environmentally friendly,” Robey said. “This is where explosives and propellants come in. The idea is that they’ll allow us to get away from pumping a lot of fluid down the wells. We’re collaborating with Lawrence Livermore National Laboratory to model the explosions and improve the predictability of forming fracture networks.”